6655405 has 8 divisors (see below), whose sum is σ = 8117784. Its totient is φ = 5236800.

The previous prime is 6655403. The next prime is 6655409. The reversal of 6655405 is 5045566.

It can be written as a sum of positive squares in 4 ways, for example, as 29929 + 6625476 = 173^2 + 2574^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 6655405 - 2¹ = 6655403 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6655403) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10606 + ... + 11215.

It is an arithmetic number, because the mean of its divisors is an integer number (1014723).

Almost surely, 2^6655405 is an apocalyptic number.

It is an amenable number.

6655405 is a deficient number, since it is larger than the sum of its proper divisors (1462379).

6655405 is a wasteful number, since it uses less digits than its factorization.

6655405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21887.

The product of its (nonzero) digits is 18000, while the sum is 31.

The square root of 6655405 is about 2579.8071633361. The cubic root of 6655405 is about 188.1011697058.

The spelling of 6655405 in words is "six million, six hundred fifty-five thousand, four hundred five".